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Single-phase and three-phase dual buck-boost/buck power factor correction circuits and controlling method thereof

a power factor correction and circuit technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of single-stage boost circuits not being suitable, polluting the grid, public nuisance, etc., to improve the thd of the three-phase dual buck-boost/buck circuit, improve the efficiency of the same, and improve the effect of conduction loss

Active Publication Date: 2014-04-22
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration enhances efficiency, reduces conduction losses, and improves power density while allowing for separate control of phase voltages, thereby minimizing THD and facilitating parallelized system operation.

Problems solved by technology

Due to the rectifier, lots of current harmonics and reactive power are generated in the grid, which pollute the grid and become a public nuisance.
For those application occasions that the input voltage is fluctuating in a wide range, e.g. the input voltage is larger than the output voltage in some occasions; a single stage boost circuit is not suitable.

Method used

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  • Single-phase and three-phase dual buck-boost/buck power factor correction circuits and controlling method thereof
  • Single-phase and three-phase dual buck-boost/buck power factor correction circuits and controlling method thereof
  • Single-phase and three-phase dual buck-boost/buck power factor correction circuits and controlling method thereof

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Embodiment Construction

[0042]To overcome the drawbacks of the conventional buck-boost PFC circuits as aforementioned, an improved topology of the dual buck-boost / buck circuit as shown in FIG. 4 of the present invention is provided. In FIG. 4, the circuit could be viewed as having two portions. The upper half portion is a buck-boost circuit, and the lower half portion is a buck circuit. FIG. 4 has the diodes Di, Dj1-Dj2, D13-D14, the switches Sj1-Sj2, S13-S14, the inductors Lj1-Lj2 (in which, i=1˜4, j=1˜2), a first output capacitor C1, a second output capacitor C2 and a neutral line N. The converter in FIG. 4 can be used as a PFC converter.

[0043]The first output capacitor C1 connects to a first output terminal and a neutral-point; the second output capacitor C2 connects to the neutral-point and a second output terminal; and the neutral line N connects the neutral point of the input power source Vin (e.g. an AC voltage) and the neutral-point. The dual buck-boost / buck circuit generates its first and second o...

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Abstract

The configurations of a single-phase dual buck-boost / buck power factor correction (PFC) circuit and a controlling method thereof are provided in the present invention. The proposed circuit includes a single-phase three-level buck-boost PFC circuit receiving an input voltage and having a first output terminal, a neutral-point and a second output terminal for outputting a first and a second output voltages, a single-phase three-level buck PFC circuit receiving the input voltage and coupled to the first output terminal, the neutral-point and the second output terminal, a first output capacitor coupled to the first output terminal and the neutral-point, a second output capacitor coupled to the neutral-point and the second output terminal, and a neutral line coupled to the neutral-point.

Description

FIELD OF THE INVENTION[0001]The present invention relates to single-phase / three-phase dual buck-boost / buck power factor correction (PFC) circuits and a controlling method thereof. More particularly, it relates to a single-phase dual buck-boost / buck PFC circuit having a single-phase three-level buck-boost PFC circuit and a single-phase three-level buck PFC circuit, which can be employed to solve the problem that the boost diode of the conventional single-phase dual buck-boost / buck PFC circuit has a relatively higher conduction loss when it is operates under a buck mode, to improve the total harmonic distortion (THD) of a three-phase three-level buck-boost PFC circuit, and to increase an efficiency of the same.BACKGROUND OF THE INVENTION[0002]In the recent twenty years or so, the power electronic technology has obtained a rapid development, and has been widely applied to the fields of electrical power, chemical engineering and communications. The electrical power apparatus generally r...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H02M7/493H02M7/487
CPCH02M1/42H02M1/4216Y02B70/12Y02B70/126Y02B70/10Y02P80/10
Inventor TAN, JINGTAOZHOU, ZHIJIANYANG, JIANPINGGOU, WENHUIYING, JIANPING
Owner DELTA ELECTRONICS INC
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